Crosspost - No start after engine fire
05-27-2004, 07:54 PM
#1
Three Wheelin'
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Crosspost - No start after engine fire
Small engine fire that made most of the wiring harness heat shielding crispy but the wires inside appeared to be fine. At the time of the fire I checked all the wires I could and everything appeared to be functioning.
Here's what I have so far:
No start condition on a known running car prior to the fire:
1) Checked resistance of Reference and Speed sensors....both are good according to Clark's garage.
2) Have fuel pressure to rail
3) Didn't have spark initially, however I found a small short on the speed sensor that I have now fixed (pulled the wires apart so they're not shorting for a temporary fix), I now have spark
4) Tach is jumping when cranked
5) MAP system shows 200-300RPM when cranking
6) Have voltage changes on the TPS according to the MAP system (i.e. pushing the gas pedal makes the voltage change)
7) Power to DME verified
8) Power to MAP system
9) Plugs are wet so theyre getting fuel
At this point I'm wondering if there's a short on the reference sensor.
If I have spark does that rule out the Speed sensor?
Is there a way to check at the DME for Reference sensor operation?
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Here's what I have so far:
No start condition on a known running car prior to the fire:
1) Checked resistance of Reference and Speed sensors....both are good according to Clark's garage.
2) Have fuel pressure to rail
3) Didn't have spark initially, however I found a small short on the speed sensor that I have now fixed (pulled the wires apart so they're not shorting for a temporary fix), I now have spark
4) Tach is jumping when cranked
5) MAP system shows 200-300RPM when cranking
6) Have voltage changes on the TPS according to the MAP system (i.e. pushing the gas pedal makes the voltage change)
7) Power to DME verified
8) Power to MAP system
9) Plugs are wet so theyre getting fuel
At this point I'm wondering if there's a short on the reference sensor.
If I have spark does that rule out the Speed sensor?
Is there a way to check at the DME for Reference sensor operation?
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05-27-2004, 09:13 PM
#2
Three Wheelin'
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Join Date: Jun 2001
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Looks like I found the problem! I used a test light and didn't notice any pulsing to the fuel injector wires. I peeled back the insulation on the #1 fuel injector wire and found that the insulation had cracked and the wires were shorting. I pulled the insulation off the reamining wires and all showed the same thing. Looks like the heat from the fire must have brittle the wires inside and cracked the insulation. Looks like i'm off to rebuild a fuel injection harness.
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